ios - 在 UIView 之间滑动手势

Question

我有一个 ViewController 类，其中我在 self.view 上有一个名为 templateView 的 UIView，它由一个名为 gridView 的 UIView 组成，这里我需要在 templateView，为此我添加了滑动手势，例如，

swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRightAction)];
swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeftAction)];

swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
swipeRight.delegate = self;

swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
swipeLeft.delegate = self;

 [templateView addGestureRecognizer:swipeRight];
 [templateView addGestureRecognizer:swipeLeft];

在 swipeRight 和 swipeLeft 中，我需要移动 gridView 左侧和右侧。我需要在这些方法中实现什么..?

Answer 1

我建议

1. 使用带参数的手势处理程序(以防您向多个 View 添加手势)；

2. 确保相关 View 已打开 userInteractionEnabled。

3. 您不需要设置手势的 delegate 除非您要实现 UIGestureRecognizerDelegate 之一方法。

因此，配置可能如下所示:

templateView.userInteractionEnabled = YES;

swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
[templateView addGestureRecognizer:swipeRight];

swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
[templateView addGestureRecognizer:swipeLeft];

然后手势处理程序可能看起来像:

- (void)handleSwipe:(UISwipeGestureRecognizer *)gesture
{
    CGRect frame = self.gridView.frame;

    // I don't know how far you want to move the grid view.
    // This moves it off screen.
    // Adjust this to move it the appropriate amount for your desired UI

    if (gesture.direction == UISwipeGestureRecognizerDirectionRight)
        frame.origin.x += self.view.bounds.size.width;
    else if (gesture.direction == UISwipeGestureRecognizerDirectionLeft)
        frame.origin.x -= self.view.bounds.size.width;
    else
        NSLog(@"Unrecognized swipe direction");

    // Now animate the changing of the frame

    [UIView animateWithDuration:0.5
                     animations:^{
                         self.gridView.frame = frame;
                     }];
}

请注意，如果您正在使用自动布局并且 View 是由约束而不是 translatesAutoresizingMaskIntoConstraints 定义的，则此处理程序代码必须适当更改。但希望这能为您提供基本概念。